During the course of editing, undo, and redo, the model is the only thing that endures.

在编辑、撤销和重做的过程中，模型是唯一保持不变的。

youdao

At the heart of this magic is the ability to undo and redo.

这个魔法的中心是撤销和重做的能力。

youdao

Commands can be used to validate the user's interaction, and to provide undo and redo support.

命令可用来验证用户的交互，并且提供撤销和重做支持。

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If that happened, you could undo the conversion and then redo it at the lower asset value, meaning a lower tax bill.

FORBES: Obama Tax Deal Would Sweeten Roth Conversions